package demo4;


public class Computer {
    public void powerOn() {
        System.out.println("打开电脑......");
    }

    public void powerOff() {
        System.out.println("关闭电脑......");
    }

    public void useDevice(IUSB iusb) {
        iusb.openDevice();

        if(iusb instanceof KeyBoard) {
            KeyBoard keyBoard = (KeyBoard)iusb;
            keyBoard.input();
        }
        if(iusb instanceof Mouse) {
            Mouse mouse = (Mouse)iusb;
            mouse.click();
        }

        iusb.closeDevice();
    }
}
